Responses
Well He Tian mentioned once that he wanted to make his own living to live comfortably with Mo in the future
But we don’t know when or how long he was gone for. He could have left after High school sort of thing.
So we can hope he didn’t leave Mo alone for many years ╥﹏╥
Everytime i reread this i remember that these are just flashback and the 4 most likely seperated ( T﹏T ) (and those extra chapters being the future. For example, the xmas chapters). Highlight from a christmas chapter, Little Mo said "is that chicken dick back" and He Tian answered that he's here, probably referring that He Tian DID left.